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Kindle Is Making It Harder to Switch to Rival eReader Brands.
(www.howtogeek.com)
This is a most excellent place for technology news and articles.
..and for those on Linux there is 'DeGouru', a tool for de-DRMing internet archive books that are lending-restricted.
A bit annoying in that it is somewhat sensitive to the Python version one has installed but there are ways to manage that which I am not qualified to advise on.